public class Problem6 {
	public static void main(String[] args) {
		int n = 100;
		int sum1 = 0;
		int sum2 = 0;
		sum1 = n*(n+1)*(2*n+1)/6;
		sum2 = ((n*(n+1))/2)*((n*(n+1))/2);
		System.out.println(""+(sum2-sum1));
	}
}
